/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/XRTrackingSystemBase.h
If the device id represents a tracking sensor, reports the serial number as a string if the device supports it.
the serial number of the device if it's available.
virtual [FString](API\Runtime\Core\Containers\FString) GetTrackedDevicePropertySerialNumber ( int32 DeviceId )